On Sunday morning, Ant tweeted from his joint Twitter account with Dec: "All the very best of luck to the little fella [email protected] for the show tonight. Lots of love from the big fella!! A ImACeleb Xxxxxx."

Meanwhile, Dec showed his best friend he was thinking of him on his birthday by tweeting a photo of the pair of them dressed as The Simpsons.

He wrote: "Happy birthday Homer. Love, Marge x."

Ant and Anne-Marie have been dating for around eight months as she supported him following the breakdown of his marriage to Lisa Armstrong and his problems with alcohol and prescription drugs.

Besties: Dec wished Ant a happy birthday on Sunday
(Image: Instagram)

Ant and Dec co-hosted last year’s series, which was won by Georgia Toffolo
(Image: REX/Shutterstock)